Puppet users - Jan 2010 - Plugin not catching exceptions

Hello,

I''m writing a plugin which make an xml-rpc call that throw an
exception if the foreign call fail (due to a bad fault-structure).
So I catch this exception in my code (I expect it to fail) :
[...]
      server = XMLRPC::Client.new( host, "/xmlrpc/db", 8069)
      begin
        result = server.call("change_admin_password", oldPassword,
newPassword)
      rescue Exception => e
        result = 0
      end
      return result
[...]

When i try to execute this on the target server, I get this error :
err: Could not retrieve catalog from remote server: Error 400 on
SERVER: wrong fault-structure: {..., line 45, in check_super\n
raise Exception(''AccessDenied'')\nException:
AccessDenied\n"} at
/etc/puppet/modules/...

When I execute the RPC call in a standalone ruby script, it work as expected.

Is there a limitation to catching exception with plugins ?
I''m a ruby beginner, may be there''s a stupid mistake.

Thanks

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